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Consolidated Statements of Operations (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 28, 2014
Jun. 29, 2013
Jun. 28, 2014
Jun. 29, 2013
Income Statement [Abstract]        
Product sales $ 321,265 $ 305,211 $ 606,060 $ 598,925
Service sales 160,536 145,904 306,249 282,528
Total net sales 481,801 451,115 912,309 881,453
Cost of product sales 131,303 123,704 253,778 237,456
Cost of service sales 70,550 64,625 135,794 125,441
Total cost of sales 201,853 188,329 389,572 362,897
Gross profit 279,948 262,786 522,737 518,556
Selling and administrative expenses 131,930 123,062 258,565 241,722
Research and development expenses 26,977 24,650 51,723 49,962
Purchased intangibles amortization 2,646 2,382 5,293 4,775
Operating income 118,395 112,692 207,156 222,097
Other expense (Note 2)   (1,575)   (1,575)
Interest expense (7,971) (7,580) (15,460) (14,765)
Interest income 1,700 1,179 3,158 2,366
Income from operations before income taxes 112,124 104,716 194,854 208,123
Provision for income tax expense (benefit) 15,595 15,402 28,023 (2,250)
Net income $ 96,529 $ 89,314 $ 166,831 $ 210,373
Net income per basic common share $ 1.14 $ 1.04 $ 1.97 $ 2.45
Weighted-average number of basic common shares 84,462 85,482 84,731 85,814
Net income per diluted common share $ 1.13 $ 1.03 $ 1.95 $ 2.42
Weighted-average number of diluted common shares and equivalents 85,177 86,576 85,538 86,950